Component Identification And Testing; Electronic Control Unit (Ecu); Neutral Switch (Model 30582 And 30583) - Toro Groundsmaster 580-D Service Manual

Component Identification and Testing

See Chapter 5 - - Electrical System (S/N Below 30101)
for additional Component Identification and Testing in-
formation. Only components that are different or new in-
formation is provided in this Chapter.

Electronic Control Unit (ECU)

The Toro electronic control unit (ECU) senses the condi-
tion of various switches, such as the seat switch, cutting
unit down switches, traction neutral switch, etc., and di-
rects power output to allow certain machine functions,
such as engine run, cutting units engage, etc.
Because of the solid state circuitry built into the control-
ler, there is no method to test it directly. The controller
1
may be damaged if an attempt is made to test it with an
electrical test device, such as a volt--ohm meter.
IMPORTANT: Before welding on the machine, dis-
connect both battery cables from the battery, dis-
connect both wire harness connectors from the
electronic control unit and disconnect the terminal Figure 7
connector from the alternator to prevent damage to
1. Electronic control unit (ECU)
the electrical system.

Neutral Switch (Model 30582 and 30583)

The neutral switch on model 30582 and 30583 is closed
when the traction pedal is in the neutral position. The
switch threads into the mounting cover on the bottom of
the hydrostat (Fig. 8).
Note: For model 30580 and model 30581 neutral
switch information, refer to Traction (Neutral) Switch
Testing and Traction (Neutral) Switch Replacement and
NEUTRAL
Adjustment in Chapter 5.
SWITCH
1. Make sure the engine is off.
2. Disconnect electrical connector from the switch.
BOTTOM OF
HYDROSTAT
3. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
Figure 8
nals.
4. With the traction pedal in the neutral position, there
should be continuity between the switch terminals.
5. With the traction pedal in the the forward or backward
position, there should be no continuity between the
switch terminals.
Groundsmaster 580--D Page 8 - - 11 Electrical System (S/N 30101 & Up) (Rev. E)
Rev. G